DOUBLE LOCKING TREMOLO BRIDGE SYSTEM:Double vibrato system usually has two parts: neck lock and bridge vibrato system.FEATURE:In addition to pressing down the handle, the double shake can also lift the handle up to make sound increase or decrease semitone, full tone or two or three full tone.COMPATIBLE WITH:Double locking tremolo system compatible with style guitar or other similar guitar.FINE WORKMANSHIP:This tremolo bridge is made of metal, good texture with fine workmanship, and durable to use.EASY TO :The tremolo bridge comes with screws and wrench, it is easier to .Colour:silverMaterial:MetalPackage Contents:1 x vibrato crank1 x Spring retractor2 x Hook screw1 x string lock2 x Chord lock mounting screw3 x Hook spring2 x Lifting screw1 x 3MM wrench1 x 2.5MM wrench1 x string drawing plateOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.